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Anti-wrinkle die of cnc tube bending machine
CNC tube bending machines for sale are often used to do complex bending work: refrigeration system for automobile and refrigerator, chairs, boiler, motorcycle protectors and ship pipeline etc. 3 axis cnc tube bending machine is driven by servomotors and thanks to these servomotors the automatic feeding, automatic rotation and bending all have high precision. Although the cnc tube bending machines for sale are very useful and the operation of the cnc tube bending machines for sale is very simple, as professional cnc tube bending machine manufacturer, YANSUMI MACHINERY can provide our clients with some useful tips to help them to get better bending works.
The material inside of the center-line of the tube is compressed when a tube is being bent by a cnc tube bending machine. When the tube is bent to a certain angle, the material will be pushed back due to the high compression force of material of the tube. If the pipe wall in this area is not supported by the bending die, wrinkles will be formed in this area. The solution of this problem is to use anti-wrinkle die to support this area and prevent wrinkles.
The shape and measurement of cnc tube bending machines anti-wrinkle die is very important. The groove of the anti-wrinkle die through which the pipe slides should be slightly larger than the outer diameter of the pipe: about 10% of the wall thickness. The groove also needs to be polished carefully to prevent from scratching the surface of the pipe. The front section of anti-wrinkle die of 3 axis cnc tube bending machine should be very thin so that can extend to the tangent point of the bending die and lean lightly on the bending die. The anti-wrinkle die is fixed to the tube bending cnc pipe bending machine by screws and nuts. To install and adjust the anti-wrinkle die on the tube bending cnc pipe bending machine, the pressure die should be well installed and offer proper pressure. It’s also necessary the use of clamping die and mandrel for the adjustment of the anti-wrinkle die.
When the cnc copper tube bending machine does bending work with anti-wrinkle die, it’s better to smear appropriate amount of lubricating oil on the groove of anti-wrinkle die to help the pipe to slide smooth through the groove. But, too much lubricating oil on the anti-wrinkle die will lead to skid of the pipe and wrinkles on the pipe.
The 3d cnc tube bending machine is often equipped with anti-wrinkle die and mandrel at the same time to achieve good bending result. The anti-wrinkle die and mandrel of a 3d cnc tube bending machine have different functions. The anti-wrinkle die is used to prevent wrinkles; and the mandrel can keep the tube from collapsing after bending.
The following points should be paid attention to in order to avoid wrinkles on pipes when bend pipes with thin wall, large diameter and small bending radius with cnc tube bending machines:
① Reduce the resistance between mandrel and the inner wall of the pipe during bending. Use wet abrasive blasting to clear the inner cavity of the pipe before putting it on the cnc tube bending machine china.
②The frame and main axis of the cnc tube bending machine should be rigid enough.
③The mandrel rod should be rigid enough to eliminate the shaking and stretching of the rod.
④The radial clearance between mandrel and the inner diameter of pipe shouldn’t be greater than 10% of the wall thickness.
⑤The clamping die, pressing die, mandrel and anti-wrinkle die of the cnc tube bending machine china should be adjusted properly. In particular, the pressure of clamping die should be carefully adjusted.
⑥The clamping of clamping die of cnc tube bending machines for sale is also very important for the bending quality when bend pipes with large diameter. In this case, the straight line between the two bends of the pipe needs to be long enough so that the clamping die can be wide enough to clamp the pipe firmly during the bending process. If the clamping die of the cnc tube bending machines for sale is short, it cannot hold the pipe pipe firmly. The pipe will skid during the bending process.
As one of the most reliable cnc tube bending machine manufacturers in china, YANSUMI MACHINERY not only provide high-quality hydraulic pipe benders, cnc small tube bending machine and cnc large tube bending machine for customers all over the word, but also cnc tube bending machines knowledge to help our customers to get better bending results.
